A Brief History of the Marque
Cycles André Bertin
6 rue Roger-Salengro
Saint Laurent Blangy (Pas-de-Calais)
Andre Bertin, a professional cyclist and successful businessman who assembled and sold mopeds and motorcycles in his French factory, also had factories in Belgium and Morocco which built bicycles.
Bertin 1955 48cc Myster moped, with rear suspension
Bertin 1955 BA71, BA72 125cc
Bertin 1955 BA75 175cc
Bertin 1955-57 BM81, BM83 124.8cc four-stroke
Bertin 1955 BV65 98cc
Bertin 1956-58 BV66 98cc
There were also Rixe models of 98cc and 250cc which may have been rebranded as Bertin in 1957-58
Sources: Cyclememory.org, bertinclassiccycles.wordpress.com, et al.